I just rebuilt my Webber 2BL Progressive carb and have a major flat spot as soon as I go to take off (have to pedal it to go) even after each time I shift it falls on its face. I did not buld the motor, it is a 1500 with dual port heads, Scat intake, points dist. has bigger cam ???, I just got a electronic dist. to put in soon. Does anyone have any ideas??

timing? accelerator pump?

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Hey,can you hand me those zip ties and that roll of duct tape?!

I played with the timing bck and advanced, didn't help. The acc. pump is brand new

if its popping through the carb when it does it its a fuel if not its a timming issue. probably not advancing correctly and your new distributor may take care of it.

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If it ain't broke ill fix that

it's not popping so I am hoping the dist. takes care of it. Hoping I can get it done this weekend. Thanks

Check the idle jet on front side of carb toward the shroud. If it's plugged you got a flat spot.

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Aircooled power!

Squirter not opening as fast as the secondary butterfly?